Zircon Grains as Recorders of Subduction Zone Metamorphism in the Southern Cyclades, Greece and the Betic Cordillera, S. Spain

Poulaki, Eirini M.; Provided, Not; Stöckli, Daniel F.; Flansburg, Megan E.; Gevedon, Michelle; Stockli, Lisa D.; Shuck, Brandon; Barnes, Jaime D.; Soukis, Konstantinos; Kitajima, Kouki; Valley, John W.

doi:10.1130/abs/2021am-365037

Cited by 4 publications

(7 citation statements)

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“…Following up on the above discussion, we interpret the WNW‐ESE trend of our “red” FIA set to record orthogonal NNE‐SSW crustal shortening in the Late Eocene to Early Oligocene. In the NFC, this time frame is indicated by our new ∼35 Ma garnet age for sample B13c, in accordance with Ar‐Ar ages for relic “S1” (Augier et al., 2005; Porkoláb et al., 2022), a mean U‐Pb age of ∼40 Ma for high‐Y monazite grains (Li & Massonne, 2018), and Eocene U‐Pb ages for zircon rims (Poulaki et al., 2020). In the Alpujarride Complex, a similar timing of burial metamorphism is indicated by the 35 Ma Sm‐Nd age obtained for high‐magnetic garnet in sample F8, in agreement with a mean age of ∼34 Ma for high‐Y monazite grains in the Los Reales unit (Massonne, 2014), 34–38 Ma white‐mica (Ar‐Ar) ages associated with HP/HT assemblages (Bessière, Jolivet, et al., 2021; Marrone, Monié, Rossetti, Aldega, et al., 2021), and a 32.4 ± 3.3 Ma U‐Pb age of rutile inclusions in garnets from high‐pressure rocks in the Kabylias (Bruguier et al., 2017).…”

Section: Discussionsupporting

confidence: 85%

“…9 kbar/650°C. Such a bi‐cyclic evolution starting in the Eocene appears further supported by recent Ar‐Ar dating of white micas revealing two age populations (38–27 and 23–12 Ma) associated with different tectonic fabrics (Porkoláb et al., 2022), and Eocene U‐Pb zircon‐rims (Poulaki et al., 2020). Also our garnet ages will be shown to confirm a protracted history of Late‐Eocene to Miocene metamorphism in the NFC.…”

Section: Geological Settingmentioning

confidence: 61%

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Refined Tectonic Evolution of the Betic‐Rif Orogen Through Integrated 3‐D Microstructural Analysis and Sm‐Nd Dating of Garnet Porphyroblasts

et al. 2022

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The detailed deformation history of the Betic-Rif orogen (Figure 1) and its relationship with distinct metamorphic events recognized in this belt are still ambiguous as is reflected in disparate tectonic models that still differ on such fundamental aspects as the timing and polarity of subduction zones, the role of crustal extension versus compression, or the emplacement history of several peridotite massifs exposed in the belt (e.g.

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Section: Discussionsupporting

confidence: 85%

Section: Geological Settingmentioning

confidence: 61%

Refined Tectonic Evolution of the Betic‐Rif Orogen Through Integrated 3‐D Microstructural Analysis and Sm‐Nd Dating of Garnet Porphyroblasts

et al. 2022

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“…These differences in metamorphic nature, as well as the stacking of the initially separated NFC and Alpujárride, were explained by subduction of the NFC to the south underneath the Alpujárride Complex. However, this hypothesis has been challenged after recent studies have revealed that the two units have similar peak metamorphic ages during the Eocene (Augier et al, 2005b;Li and Massonne, 2018;Poulaki et al, 2020;Bessière et al, 2021a, Bessière et al, 2021bAerden et al, 2020). Based on our provenance data showing similar sedimentary sources throughout their depositional history, we suggest that the NFC and Alpujárride originated and remained in proximity to each other.…”

Section: Implications For the Tectonic Evolution Of The Western Medit...mentioning

confidence: 55%

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

Poulaki

Stöckli

2022

Front. Earth Sci.

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Since the early Cenozoic, the closure of the Alpine Tethys in the Western Mediterranean has been accomplished by protracted subduction, followed by collision and orogenic collapse. The internal zones of the Betic Cordillera (southern Spain) and Rif (northern Morocco) experienced subduction metamorphism and subsequent exhumation due to the westward migration of the orogenic system. The detrital provenance of these meta-sedimentary units contains crucial insights into their pre-subduction stratigraphic arrangement, which is essential to constrain the pre-Cenozoic paleogeography and tectonic evolution of the Western Mediterranean. This study focuses on the Nevado-Filábride Complex (NFC) and the Eastern Alpujárride Complex in the Internal Betic Cordillera. New depth-profile zircon U-Pb LA-ICP-MS data from the NFC (N = 72) and Alpujárride (N = 21) and in situ apatite U-Pb data from a metabasite within the NFC allow us to establish the pre-subduction stratigraphy, sedimentary provenance, and paleotectonic configuration of the Iberian rifted margin during the Paleozoic–Early Mesozoic. Our dataset demonstrates that the NFC represents an intact Devonian to Early Jurassic stratigraphic sequence that records the evolution of the Western Mediterranean from the Variscan orogeny to rifting and opening of the Alpine Tethys. Detrital zircon U-Pb age modes of the NFC remain remarkably similar for over 200 Myr with only the differences being the progressive addition of new zircon modes related to depositional ages. Additionally, a comparison between the provenance record of the NFC and Alpujárride reveals notably similar zircon signatures of Carboniferous and Permian strata. This study reports the first data from the Triassic–Jurassic strata that record the opening of the Alpine Tethys. Additional evidence for rifting is present in the metabasites from the Veleta unit yielding in situ apatite U-Pb ages of 197 Ma, recording CAMP magmatism and Early Jurassic rifting in the Alpine Tethys. The data demonstrate a palinspastic connection between the NFC and the Alpujárride. Based on these extensive new provenance data, we propose a pre-subduction tectonic configuration in which the NFC and Alpujárride both represent adjacent attenuated continental fragments that are separated from the southern Iberian rifted margin by a narrow oceanic domain of the Alpine Tethys in the early Mesozoic.

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“…The metamorphism of both the Nevado-Filábride and Alpujarride complexes took place during the Alpine orogeny (Sanz de Galdeano & Garrido, 2016). Recent geochronological studies on white mica, apatite and zircon indicate the earlier high-pressure, low-temperature metamorphism took place during the Eocene, with higher temperature metamorphism related to exhumation in the Miocene (Bessière et al, 2022;Poulaki et al, 2023).…”

Section: Principles and Methodsmentioning

confidence: 99%

The provenance of a turbidite system within a tectonically active wrench basin: Insights from heavy mineral characteristics of Miocene sandstones in the Tabernas Basin, south‐east Spain

McGill,

Milne,

Morton

et al. 2024

The Depositional Record

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This paper provides insight into the provenance of the Late Miocene turbidite succession of the Tabernas Basin. Although this area has been extensively studied, only limited attention has been paid to sediment provenance. Through heavy mineral analysis, it has been possible to identify provenance‐related signatures from the adjacent Sierra de los Filabres and Sierra Alhamilla uplifts. Stable mineral ratio data confirm that the Sierra de los Filabres provided sediment with generally higher chloritoid:tourmaline and higher Type Bii garnet abundances than those derived from the Sierra Alhamilla. By comparison, modern sediments derived from the Sierra Alhamilla have garnet compositions with larger proportions of Types A and C, suggesting that the basinal sediments were not sourced from the incipient Sierra Alhamilla Uplift. Heavy mineral analysis confirms that the Sierra de los Filabres was the primary source for the Tabernas succession, with minor variations indicating that the erosive part of the system migrated across the uplift. Input was predominantly from the Nevado–Filábride Complex, with minor amounts from the small remnant of the Alpujarride Complex attached to the southern margin of the Sierra de los Filabres. Evidence strongly suggests a single sediment routing system but identifies some subtle provenance variations. In particular, there was a shift in detrital garnet composition between the Sartenella Formation and the Verdelecho Formation, Solitary Channel and El Gordo Megabed, which is attributed here to a shift in catchment within the Sierra de los Filabres. This shift appears to have occurred during the deposition of the Sartenella Formation, since the garnet compositions of the Verdelecho Formation and Solitary Channel are similar to each other and differ from the preceding part of the Sartenella Formation. The Solitary Channel displays marked heterogeneities in provenance character, manifested by changes in chloritoid abundance, consistent with previous studies that suggest the depositional architecture in the channel was influenced by high‐frequency changes in sediment flux and sea level.

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Zircon Grains as Recorders of Subduction Zone Metamorphism in the Southern Cyclades, Greece and the Betic Cordillera, S. Spain

Cited by 4 publications

References 0 publications

Refined Tectonic Evolution of the Betic‐Rif Orogen Through Integrated 3‐D Microstructural Analysis and Sm‐Nd Dating of Garnet Porphyroblasts

Refined Tectonic Evolution of the Betic‐Rif Orogen Through Integrated 3‐D Microstructural Analysis and Sm‐Nd Dating of Garnet Porphyroblasts

The paleotectonic evolution of the western Mediterranean: provenance insights from the internal Betics, southern Spain

The provenance of a turbidite system within a tectonically active wrench basin: Insights from heavy mineral characteristics of Miocene sandstones in the Tabernas Basin, south‐east Spain

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